Non-ultimate codes will still redeem once you have ultimate at a lower amount of time. Game pass is 3:2 conversion and Gold is 3:1. So a a 3 month game pass will give 2 months of ultimate and a 3 month gold will give 1 month of ultimate.
When you upgrade, all gamepass and gold combine into ultimate. Like above, game pass until November will turn into ultimate until December (get a month with the upgrade). If you have a year of gold and a year of pass, you get 2 years (+1 month) of ultimate.
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